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#### AC Fundamentals | Interview MCQ | AC Power Fundamentals Module

Alternating Current, Circuits, AC: Certain circuits include sources of alternating electromotive forces of the sinusoidal form V = V0 cos(ωt). alternating current (AC), how it works, basic AC source and AC generators, difference between AC.

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Question 1: A parallel resonant circuit can be used?

• to amplify certain frequencies
• to reject a small band of frequencies
• both (a) and (b)
• as a high impedance
• Answers: both (a) and (b)

Question 2: Higher the Q of a series circuit?

• narrower its pass band
• sharper its resonance
• greater its bandwidth
• Answers: narrower its pass band

Question 3: Time constant of a capacitive circuit increases with the?

• decrease of capacitance and decrease of resistance
• decrease of capacitance and increase of resistance
• increase of capacitance and decrease of resistance
• increase of capacitance and increase of resistance
• Answers: increase of capacitance and increase of resistance

Question 4: For a sine wave with peak value Imax the RMS value is?

• 1.414 Imax
• 0.707 Imax
• 0.5 Imax
• 0.9 Imax

Question 5: The form factor is the ratio of?

• average value to RMS value
• none of the above
• RMS value to average value
• peak value to RMS value
• Answers: RMS value to average value

Question 6: At ...... frequencies the parallel R-L circuit behaves as purely resistive?

• high
• very low
• low
• very high

Question 7: To neglect a current source, the terminals across the source are?

• replaced by source resistance
• open-circuited
• replaced by capacitance
• short-circuited

Question 8: In a pure inductive circuit?

• the current can lead or lag by 90º
• the current is in phase with the voltage
• the current lags behind the voltage by 90º
• the current leads the voltage by 90º
• Answers: the current lags behind the voltage by 90º

Question 9: In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value ?

• will increase the selectivity of the circuit
• will change the maximum value of current at resonance
• will change the impedance at resonance frequency
• will change the resonance frequency
• Answers: will increase the selectivity of the circuit

Question 10: Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

• none of the above
• either (c) or (d)
• series
• parallel

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